Anyone familiar with FDSFX panel? Also, help with gauges??

Hi, I want to know what are gauges and dat files in fsx and want anyone who knows about Marcus Thompson's FDSFX panel. I know how to select a file for a switch but have to do this for every flight. I want to permanently change the default sounds to my own sounds. Does this require a dat file and gauge???? as the sounds currently have a dat file and gauge for each of them.

Thank you very much and hope for a response.